Valve-motion for rock-drills.



,To all whom z' m ay con cern.'

vis denoted 'entran sra'rns iirrinvrV ois-Flon.

LEWIS C. BAYYLES, Oli` JOHANNESBURG, TRANSVAAL, ASSIGNOR TOINGERSOLL-RAND COMPANY, OF NEW YORK', NY., A CORPORATION OF NEW JERSEY.

VALVE-MOTION ron Roon-Darme Specification ofLetters Patent,

Patent-ea None-191s'.

Beit known that I,.L r.w'1s C. BAYLs,a citizen of the United States,andl resident of' Johannesburg, Transvaal, have invented a new anduseful Valve-Motion for Rock- Drills, of which the following is aspecifi cation. v

This invention relates to a 'valve motion-y or rock drills and has forits'object to provide' certain improvements in the construction, formand operation of the' valve mechanism whereby a -valve mayl be employed`which-is very simple in constructiom positive 'in its action and whichhas ,a very slight movement to accomplish the. alternate opening andclosing of the inlety and discharge aassages for the opposite ends ofthel piston chamber, tho action of the valve being. automatic.-

A practicalI embodiment 'of my invention is represented in thelaccotnpanying drawings, in which- FigureV 1' represents linlongitudinal centralfsection somuch ot' a .rock drill as will give aclearnnderstanding'of my invention,

II `ig..2 is a section taken inthe 'plane' f the lineA-A of Fig-1,looking' in the direction of the arrows, Fig. 3' is a'topplan' view ofthe cylinder, the valvel chestbeing. shownin horizontal section -.talrenin' the plane of the' line 12F-B of'Fig.' 1, and Fig. 4 isa detail viewsimilar to Fig. 3,'with the valve inV its position opposite to that'shown '1n Fig. 3. i

The'cylind'erof the 'rock'drill is denoted by 1 and its piston by' 2.The valve chest by 3, which 'valvechest 'is provided with a motive liaidinlet chamber 4` and outlet chamber. Intermediate the chambers 4 'and .5is'located vertical cylindrical chamber v6 from vwhich diametricallylopposite slots 7, 8,;lead to-the chambers 4 andv 5, respectively,

A winged valve 9, 10, 11, has its cylindrical body p rtion' 9 fitted tothe cylin-4 drical chambery its wing 10 projected into the slot 7 andits wing 11 projectedmto the slot 8. fIhe width' of the slots 7 and'8and the thickness of thel wings 10 and 11 are such that the valve is`permitted a slight oscillatory movement for bringing the op positefaces of the wing lOalternately into engagement with valve .seats 12,13, and the opposite faces of the wing 11 alternately into engagementwith valve seats 14, 15.V

Ports 16, 17, lead from the valve seats 12, 13,

to ,motive .fluid inlet passages 18, `19,'whicli open into the baclrandfrontendsvrespectively of the cylinder 1. Ports 20, 21, lead fromV thevalve' seats 14, 15, to discharge passages 22, 2B, which open,respectively, into theback and front ends of the'cyliniderl'inte'rmediate the port openingsl of the motive fluid-inlet passages18, 19.

Presnpposing the parts tol-be in the positionshown in Figs. `1,I 2 and3, withv the piston 2 traveling in the direction. shown by the arrowthereon, the wing 10 of the valve has opened themotivefluid inletpassage 18 to' the mai-n .inlet chamber 4 'and has 'closed the motivefluid. inlet passage 19. At-

vthesame time, the wing 11 of the valve has opened the discharge passage23 -to the com- ,mon outletchamber and has closed the discharge passage22. As the piston 2 nears the limit of its forward movement, it willHfirst close the discharge passage 23 and for the balance'of its forwardmovement will compress the motive lfluid in the passage 19 suilicientlyto throw the valve overv into the yposition shown in'Fig. 4,v thusopening the motive fluidv inlet passage .19 to the main inlet chamber 4and opening the fluid discharge passage 22 to the main outlet chamber 5,and at the same time, closing the inlet passage 18 and the ontlet'passage 23. This will start the piston o n its return movementand as itnears the limit of its return 'movement it-.will-r'st close theldischarge passage 22 and then compress the ludsullciently in the inletpassage 18- to throw the valve back to the position shown inl Fig. 3.

lIt will thus be` seen 'that ,the-valve and ports, 'constructed and*arranged. as .herein set forth, permits the valveto control the vopeningand closing, not only of thev inlet passages but alsol ofthedischargepassages ,so4 as to insure a suflicient overbalancing of pressure-uponthe valve Wings tov throwy the valve automatically' at the desired timeslto insure the proper reciprocatio'n 'ofthe piston.

While I have shown this valve mechanism in connection with va rockdrill, it is to' be understood that I do-not wish to limit myself tosuch use but contemplate its use Wherever applicable in percussivemachines or tools. z

What I claim is 1..A cylinder having vindependent inlet and dischargepassages. for both ends, its

' double Winged oscillating; valve lia-ving one piston, a valve chestanda fluid actiiated inlet' passages to control the doable Wingedoscillating valve having one `Wing arranged to alternately'open andclose the inlet passages and the other Wing arranged to alternately openandclose the discharge passages.`

3. A- cylinder, its piston, a valve' chest having independent inlet vanddischarge passages for both ends of the cylinder, and a duid actuateddouble Winged 4 oscillating Valve having one VWing arrangedto open theinlet passage for one end of the cylinder at the saine time that itsother Wing opens the discharge passage for the other end of thecylinder.

.a cylinder, its piston, a valve chest havm ring .independ cn't inletand discharge passages for both ends ofthe cylinder and a fluid actuateddouble winged'oscillatin valve having one Wing arranged to open t' einlet pas sage for4 one end of the cylinder at the same time that itsother Wing opens the discharge passage for the other end of thecylinder, said irst named Wing also being arranged to close the otherinlet passage atthe saine time that the second named 'Wing closes theother discharge passage.

5. cylinder, its piston, a valve chest havinginlet and dischargepassages for both ends of the cylinder and a double Winged oscillatingvalve aving one Wing arranged incassa to alternately open and close the'inlet pasu sages and another Wing arranged yto alternately open andclose the discharge passages.

'sitely arranged slots leading therefrom to the inlet and outletchambers, inlet passages :for both ends of the cylinder havingportsleading from theslot communicating with the inlet chamber, dischargepassages for both ends of the cylinder having ports' leading iroin 'theslot coannunicatingzjl 'with the ing valve seated in the valve chamberwith its Wings located in said slots for alternately opening and closingthe inlet and discharge passages.

7. A. cylinder9 its piston, a valve chest com taining a valvechamber'having two radially disposed slots one communicating with themotive fluid inlet and the other With external 4 lftinosphere, inletpassages for both ends of 'the cylinder leading to the inlet slot,disehargepassages for bothends of the cylinder leading to the exhaustslot and' a double Winged. oscillating valve seated. in the valvechamber With its -Wings located in said slots for alternately openingand closing the inlet and discharge passages. f In testimony, that lvclaim the foregoing as my invention, l have" signed my name in presenceoi two Witnesses, this twenty-sev.- enth day of October 1909. 4

LEWIS C. BAYLES.

Witnesses: 4

F. GEORGE BARRY, C. S. SUNDGREN.

outlet chamber and a double Winged oseillat-

